ui-shared: restrict to 15 levels

Perhaps a more ideal version of this would be to not print breadcrumbs
at all for paths that don't exist in the given repo at the given oid.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reported-by: Fydor Wire Snark <wsnark@tuta.io>

ui-shared.c

@@ -945,12 +945,13 @@ static void cgit_print_path_crumbs(char *path)
 {
 	char *old_path = ctx.qry.path;
 	char *p = path, *q, *end = path + strlen(path);
+	int levels = 0;
 
 	ctx.qry.path = NULL;
 	cgit_self_link("root", NULL, NULL);
 	ctx.qry.path = p = path;
 	while (p < end) {
-		if (!(q = strchr(p, '/')))
+		if (!(q = strchr(p, '/')) || levels > 15)
 			q = end;
 		*q = '\0';
 		html_txt("/");
@@ -958,6 +959,7 @@ static void cgit_print_path_crumbs(char *path)
 		if (q < end)
 			*q = '/';
 		p = q + 1;
+		++levels;
 	}
 	ctx.qry.path = old_path;
 }